"Waekros" is a name you do not want to say in Ystrai unless you want cold glares.
Waekros was once a famous battlemage in the army of Ystrai, something unheard of previously, as the natives are distrustful of magic and see it as "dishonorable." During his campaign, Waekros was able to turn that idea around, offering powerful illusions to trick opposing armies, enchantments to force captives to speak, conjured creatures to change the battlefield, abjuration to protect the wounded, and evocation to drive away enemies and heal those in need.
Unfortunately, he was a master of all schools of magic. Once, his superiors caught him tampering with necromancy. They let him off the hook that once to avoid ruining his reputation and as a favor. However, he was not grateful. His breaking point came when there was an ambush of his platoon, and many of his comrades died. Driven by rage, he raised his dead comrades into undeath to win the battle and returned to find his camp abandoned.
Looking through some files, he found that his commanders had intentionally sent him to be ambushed, believing in his abilities, but unfazed at the idea of his death. Hearing this only fueled the burning in his heart, and he swore revenge against his previous comrades. He lead his army of undead against his own sword brothers, slaughtering thousands, and rising them into his ranks.
The constant warring eventually drove Waekros to madness, and once a force large enough to take him down was formed, they defeated his army and killed him as he was attempting some dark ritual. All of the artifacts were locked in the vault of Ystrai, and his legacy is shunned by the people, hoping for his name to be forgotten.